Hi David, can't validate ULTRABOLIDO, seems to be a dead site already.
Yes, something like what ARCHIVE.ORG has is what I had in mind.

Hi Norbert, I guess you can appreciate my request, being the administrator of POPOT.
A web-based DOSBox would be great, preferably by YHKwong because of the nice renders when played full-screen.
The challenge that comes to my mind is, how do you access all those mods from your archive?

Looking forward to your upcoming mod.
Hope it's not as hard as SuavePrince's.

DOSBox might be too old-fashioned.
(What follows is technical, sorry.)
I was originally thinking about using Emscripten (Emscripten and SDL 2 Tutorial) with SDLPoP, but for highscores I don't want the game to run (just) client-side, so SDL2_net would need to sync clients with server game sessions.
This all seems too complicated anyway.
I'm instead wondering if maybe web-based remote desktop could be used to allow users to launch and connect to jailed (contained) remote desktop sessions with limited permissions. Maybe with Apache Guacamole or something, I haven't really looked into it yet. Then use that with a modified SDLPoP executable that auto-saves replays, starting in the user-specified level of the user-specified mod.
Then again, even that sounds unnecessary. Two programs already simplify launching mods (Total Pack, poplaun).
Plus, all that work for dozens of people...
Hm, maybe just wait and see if other people will take the game in interesting directions.